[Bug c/59939] No warning on signedness changes caused by implicit conversion

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59939

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
IIRC this was done so that code which uses macros and have conditional code
like:

MACRO1 || fn1(a, b)